The 2013–14 season was Olympiacos' 55th consecutive season in the Super League Greece. Olympiacos also participated in the Greek cup and 2013–14 UEFA Champions League group stage. The first game of the season took place at OAKA on 19 August against AEL Kalloni.

Olympiacos won the domestic title for the fourth year in a row, breaking the all-time record for the biggest point difference between the first and the second team in the regular season. The most memorable accomplishment of the year was arguably the 2–0 win over Manchester United in the first leg of the round of 16 of the Champions League, though not managing to defend that score in England.

At the domestic cup, Olympiacos was eliminated in the semifinals by PAOK 2–2 on aggregate, falling off of the away goals rule.

Olympiacos' top goalscorer for the season was striker Konstantinos Mitroglou, who moved to Fulham at the end of the January 2014 transfer window for a fee of approximately €15 million.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

For recent transfers, see List of Greek football transfers summer 2013

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Olympiacos U20 is the youth team of Olympiacos. They participate in the Superleague U20 championship and in UEFA Youth League competition. They play their home games at the 3,000-seater Renti Training Centre in Renti, Piraeus.

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